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| Number | Title | Issue Date |
| 8186172 | Structure for sensing refrigerant flow rate in a compressor A structure for sensing refrigerant flow rate in a compressor. The structure includes a passage forming member, a restriction hole, a differential pressure-type flow rate sensor, and a partition plate. The compressor includes a housing connected to an external refri... | 05/29/2012 |
| 8151585 | System and method of disabling an HVAC compressor based on a low pressure cut out A system and method is provided for monitoring a system pressure to infer whether a high pressure cut out (HPCO) switch has opened disabling a heating, ventilating, and air conditioning (HVAC) compressor. A system and method are also provided for determining whether... | 04/10/2012 |
| 8127563 | Linear-compressor control system, a method of controlling a linear compressor and a linear compressor A linear compressor control system includes an electronic circuit controlling an electric motor that drive a piston of the compressor, such that the motor is operated intermittently with an on-time (tL) and an off-time (tD) to keep the compress... | 03/06/2012 |
| 8117859 | Methods and systems for controlling air conditioning systems having a cooling mode and a free-cooling mode An air conditioning system having a cooling mode and a free-cooling mode. The system having a refrigeration circuit having a compressor and a pump; a suction pressure sensor for measuring a suction pressure of the compressor; a discharge pressure sensor for measurin... | 02/21/2012 |
| 8117858 | Air conditioner An air conditioner is switchable between a cooling mode and a heating mode using highly pressurized hot gas in a refrigerant cycle. During the cooling mode, a controller controls an input electric current to a solenoid to operate the control valve based on a lower p... | 02/21/2012 |
| 8113008 | Refrigeration circuit and method for operating a refrigeration circuit The invention relates to a refrigeration circuit having a mono- or multi-component refrigerant circulating therein, said refrigeration circuit comprising, in the direction of flow, a condenser, a collecting container, a relief device connected upstream of an evapora... | 02/14/2012 |
| 7975498 | Intelligent controller for refrigerating and air conditioning systems An intelligent controller (68), adapted for regulating operation of either a refrigeration system or an air conditioning system (20), receives an output electrical signal produced by a pressure sensor (72, 74, 76, 78) included in the system (... | 07/12/2011 |
| 7975497 | Refrigeration unit having variable performance compressor operated based on high-pressure side pressure In a refrigeration unit including a variable performance compressor driven by an inverter motor, a sensor is configured to detect a physical amount corresponding to a refrigerant pressure on the high-pressure side of a refrigerant circuit. A measured value of the ph... | 07/12/2011 |
| 7950242 | Control valve for a refrigerant compressor and refrigerant compressor A refrigerant compressor has a control valve for controlling the degree of conveyance of the refrigerant compressor by setting a drive housing pressure pC of the refrigerant compressor. A control body controls a conveying-side control line between a disch... | 05/31/2011 |
| 7905102 | Control system A stability control algorithm is provided for a centrifugal compressor. The stability control algorithm is used to control a variable geometry diffuser and a hot gas bypass valve (when provided) in response to the detection of compressor instabilities. The stability... | 03/15/2011 |
| 7900466 | Air-conditioning system for a motor vehicle An air-conditioning system for a motor vehicle includes a coolant circuit, through which it is possible to pump coolant with the aid of a compressor, the air-conditioning system having a torque-determining unit for determining a drive torque required for operating t... | 03/08/2011 |
| 7797957 | Methods and apparatus for linearized temperature control of commercial refrigeration systems Methods, systems, and apparatus for linearizing control of a commercial refrigeration system. In an embodiment of the invention, a controller is configured to receive a non-linear sensed suction pressure and convert the suction pressure to a linear temperature equiv... | 09/21/2010 |
| 7658081 | Structure for sensing refrigerant flow rate in a compressor The compressor has a differential pressure type flow rate detector that obtains the pressure in an upstream passage and the pressure in a downstream passage to detect a refrigerant flow rate within a refrigerant passage. The detector has an accommodation chamber, an... | 02/09/2010 |
| 7631512 | Vehicle cooling system An integrated cooling system includes two separate evaporator coils. Each evaporator coil has its own shutoff, thereby allowing for individual control over the cooling of each of two vehicle spaces. The evaporator coils may be disposed within the vehicle to cool the... | 12/15/2009 |
| 7594410 | Method of controlling air conditioner for vehicles A vehicle air conditioner is controlled to a target control value that controls a swash-plate control value of a swash-plate variable capacity compressor. The variable control is based on temperature deviation between target evaporator temperature and actual evapora... | 09/29/2009 |
| 7578139 | Refrigeration system including refrigeration cycle and rankine cycle A controller reduces a rotational speed of a Rankine cycle from a predetermined normal rotational speed during an operation of a compressor in a predetermined state when the controller determines that a predicted refrigerant flow quantity, which is predicted by assu... | 08/25/2009 |
| 7559208 | Displacement control mechanism for variable displacement compressor A displacement control mechanism for a variable displacement compressor includes a first valve hole, a first valve body, a pressure sensing means operable to sense pressures of first and second points in a discharge pressure region to adjust a position of the first ... | 07/14/2009 |
| 7555911 | Cryogenic refrigerator An inverter (22) is provided between a power source (20) and a suction/discharge valve driving motor (14) that controls cycle time of suction and discharge of a refrigerator unit (10). An output frequency of the inverter (22) is co... | 07/07/2009 |
| 7523620 | Displacement control mechanism for variable displacement compressor A displacing device is incorporated in a displacement control valve. The displacing device includes a first pressure chamber, a second pressure chamber, a second bellows, a transmission rod, and an urging spring. The second pressure chamber communicates with a sucti... | 04/28/2009 |
| 7437881 | Control valve for variable displacement compressor To provide a control valve for a variable displacement compressor, which is capable of stably operating in a pressure control area, and causing the compressor to quickly shift to operation with the minimum displacement. The control valve for a variable displacement ... | 10/21/2008 |
| 7421850 | Refrigeration system and method of operating the same A refrigeration system including an evaporator, a suction header in fluid communication with the evaporator, a compressor in fluid communication with the suction header, and a condenser in fluid communication with the compressor and the evaporator. The refrigeration... | 09/09/2008 |
| 7412841 | Turbo chiller, compressor therefor, and control method therefor A compressor for a turbo chiller that can stably and efficiently operate in various operating states is provided. An aerodynamic feature map showing a rotating stall line at which rotating stall occurs is provided on a map represented by a flow parameter reflecting ... | 08/19/2008 |
| 7392659 | Dynamic control of a variable displacement compressor Controlling displacement in a variable displacement compressor of an automobile air conditioning system entails detecting the temperature and humidity level of air entering the evaporator, setting a target air probe temperature from inside the automobile, and readin... | 07/01/2008 |
| 7389649 | Cooling system with variable duty cycle capacity control A control system for a cooling system includes a first sensor for sensing a property indicative of demand for cooling and a controller coupled to the sensor. The controller produces the variable duty cycle control signal in response to the property and causes the co... | 06/24/2008 |
| 7370487 | Refrigerating cycle device capable of ensuring oil return Whether or not a flow rate of a circulating refrigerant is higher than a predetermined threshold value is judged and when the flow rate is higher than the predetermined threshold value, the discharge flow rate of a compressor 11 is controlled in accordance wi... | 05/13/2008 |
| 7364408 | Crank case shut off valve The invention provides a compressor with a shut off valve disposed between the crank case and the suction cavity. The valve is moveable between an open and closed position in response to the pressure in the discharge cavity of the compressor. The valve is an on/off ... | 04/29/2008 |
| 7356999 | System and method for stability control in a centrifugal compressor A stability control algorithm is provided for a centrifugal compressor. The stability control algorithm is used to control a variable geometry diffuser and a hot gas bypass valve (when provided) in response to the detection of compressor instabilities. The stability... | 04/15/2008 |
| 7339283 | Electronic load regulator An electronic load regulation system for a locomotive may comprise a solid state replacement for existing electro-mechanical load regulators that are used to adjust the excitation current in the field windings of the locomotive's generator. A pressure sensor may inc... | 03/04/2008 |
| 7334431 | Evaporator and heat exchanger with external loop, as well as heat pump system and air conditioning system comprising said evaporator or heat exchanger An evaporator including an evaporating chamber equipped with a drainage. The drainage drains accumulated liquid from the evaporator's lower parts and includes an external expansion driven injector and/or an external pump. The evaporator can be used e.g. in a heat ex... | 02/26/2008 |
| 7302805 | Sensor array used for monitoring at least two physical parameters A sensor array, particularly for vehicle air conditioners, having a housing, in which an electronic unit, a first sensor element connected with the electronic unit for measuring a first physical parameter, and a second sensor element connected with the electronic un... | 12/04/2007 |
| 7293965 | Limiter device for variable displacement compressor A limiter device is provided in a variable displacement compressor capable of varying a discharge displacement per revolution and compressing a fluid in a cycle. The limiter device includes an operating characteristic acquiring means for acquiring a predetermined ch... | 11/13/2007 |
| 7287395 | Distributed cooling system A system includes a plurality of distributed refrigeration units respectively coupled to discrete refrigeration circuits. Each refrigeration unit may include a variable compressor, a fixed compressor, a condensing unit, and a controller. The controller compares an o... | 10/30/2007 |
| 7275379 | Automotive HVAC system and method of operating same utilizing enthalpy-based control The present invention concerns a method for controlling the operation of an automotive HVAC system. The HVAC system includes at least a refrigerant compressor and a refrigerant evaporator. The method includes the steps of calculating an ambient air enthalpy value; c... | 10/02/2007 |
| 7273356 | Control valve device for variable capacity type swash plate compressor There is disclosed a control valve device for a variable capacity type swash plate compressor for use in an air conditioning system. The device comprises an introducing passage for connecting a discharge chamber to a crank chamber in the compressor, and a control va... | 09/25/2007 |
| 7263849 | Refrigerating system for refrigerator A refrigerating system for a refrigerator is disclosed. The refrigerator includes a compressor that compresses refrigerant, a condenser connected to the compressor that condenses compressed refrigerant, an expansion valve connected to the condenser that expands cond... | 09/04/2007 |
| 7263877 | Determination of the piston stroke in a reciprocating piston machine A method for determining the piston stroke of a reciprocating piston machine having a variable stroke, for example a swashplate compressor, a pivoting plate compressor or a pivoting ring compressor, especially for air-conditioning installations in motor vehicles. | 09/04/2007 |
| 7243502 | Control system for variable displacement compressor In a control system of a variable displacement compressor, a pressure sensing means mechanically detects at least one pressure in the refrigerant circuit. A varying means varies a reference value for positioning a valve body. A pressure detector electrically detects... | 07/17/2007 |
| 7234324 | Method and installation for controlling at least one cryogenic centrifugal compressor compression line Methods and apparatuses for controlling systems of cryogenic centrifugal compressors. A predetermined curve in the form of a first parameter as a function of a second parameter is selected. The first parameter represents the rotational speed of a compressor, and the... | 06/26/2007 |
| 7225627 | Vapor compression system and method for controlling conditions in ambient surroundings A vapor compression system including an evaporator, a compressor, and a condenser interconnected in a closed-loop system and a method of operating such a system. The method includes the conversion of expanded liquid heat transfer fluid from a liquid form to a high q... | 06/05/2007 |
| 7216498 | Method and apparatus for determining supercritical pressure in a heat exchanger A method and apparatus to determine the pressure of a supercritical refrigerant within a heat exchanger of a transcritical vapor compression system. A plurality of measurements, e.g., temperature, are obtained at spaced locations on the heat exchanger and the locati... | 05/15/2007 |
